阅读说明：本技术 一种高导热块体制备方法 (Preparation method of high-thermal-conductivity block ) 是由 林剑锋 冯伟明 于 2021-09-27 设计创作，主要内容包括：本发明高导热块体制备方法,S1、将人工石墨粉碎,得到A料,将膨胀石墨粉碎,得到B料；S2、将A料和B料按比例混合,B料多于A料；S3、将混合后的A料和B料压成块体,块体表面形成大量微型孔隙结构,贯穿整个厚度方向；S4、块体上涂覆或浸渍氧化石墨或氧化石墨烯；具体的,先涂一面,干燥,再涂另一面,干燥；S5、热处理,逐渐升温,先100℃升至300℃,再升至1000℃,再升至3000℃；S6、平压,压力0-1000吨,升压速度1吨/min,得到密度1.2-2g/cm～(3)的高导热块体。本发明制备出来的高导热块体能够大幅提升纵向导热性能,纵向导热大于50w/m.k,满足高厚度场合的使用需求。(The preparation method of the high-thermal-conductivity block comprises the steps of S1, crushing artificial graphite to obtain a material A, and crushing expanded graphite to obtain a material B; s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A; s3, pressing the mixed material A and material B into a block, wherein a large number of micro-pore structures are formed on the surface of the block and penetrate through the whole thickness direction; s4, coating or impregnating graphite oxide or graphene oxide on the block; specifically, one side is coated and dried, and then the other side is coated and dried; s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃; s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2-2g/cm 3 The high thermal conductivity block. The high-thermal-conductivity block prepared by the method can greatly improve the longitudinal thermal conductivity, the longitudinal thermal conductivity is more than 50w/m.k, and the use requirement of high-thickness occasions is met.)

1. A preparation method of a high-thermal-conductivity block is characterized by comprising the following steps:

s1, crushing artificial graphite to obtain a material A, and crushing expanded graphite to obtain a material B;

s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A;

s3, pressing the mixed material A and material B into a block, wherein a large number of micro-pore structures are formed on the surface of the block and penetrate through the whole thickness direction;

s4, coating or impregnating graphite oxide or graphene oxide on the block;

specifically, one side is coated, then dried at the temperature of 60-80 ℃, and the other side is coated and dried at the temperature of 40-80 ℃;

s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;

s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2-2g/cm³The high thermal conductivity block.

2. The method for preparing a high thermal conductivity block according to claim 1, wherein: the length of the material A is 1mm-1000mm, the width is 1um-100um, and the thickness is 1um-100 um.

3. The method for preparing a high thermal conductivity block according to claim 1, wherein: the ratio of the material B to the material A is 3:1 to 7: 1.

4. The method for preparing a high thermal conductivity block according to claim 1, wherein: the thickness of the block in the S3 is 1mm-10cm, and the density is 0.1-1g/cm³。

5. The method for preparing a high thermal conductivity block according to claim 1, wherein: the thickness of the graphite oxide or the graphene oxide is 100um-10 mm.

Technical Field

The invention relates to the field of graphene, in particular to a preparation method of a high-thermal-conductivity block.

Background

The heat conducting performance of the conventional heat conducting block in the plane direction and the vertical direction has obvious anisotropy, the plane direction can reach more than 1000w/m.k, but the longitudinal heat conducting performance is lower than 5w/m.k, so that the heat radiating requirement of some special occasions cannot be met, and particularly when a product with thicker thickness is required in an application scene to solve the heat radiating problem.

Disclosure of Invention

The invention aims to provide a preparation method of a high-thermal-conductivity block, which mainly solves the problems of insufficient thermal conductivity coefficient, insufficient heat flux and the like of the existing graphite/graphene soaking film material.

The invention realizes the purpose through the following technical scheme: a preparation method of a high thermal conductivity block comprises the following steps:

s1, crushing artificial graphite to obtain a material A, and crushing expanded graphite to obtain a material B;

s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A;

s3, pressing the mixed material A and material B into a block, wherein a large number of micro-pore structures are formed on the surface of the block and penetrate through the whole thickness direction;

s4, coating or impregnating graphite oxide or graphene oxide on the block;

specifically, one side is coated, then dried at the temperature of 60-80 ℃, and the other side is coated and dried at the temperature of 40-80 ℃;

s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;

s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2-2g/cm³The high thermal conductivity block.

Preferably, the material A has the length of 1mm-1000mm, the width of 1um-100um and the thickness of 1um-100 um.

Preferably, the ratio of the material B to the material A is 3:1 to 7: 1.

Preferably, the block in S3 has a thickness of 1mm-10cm and a density of 0.1-1g/cm³。

Preferably, the thickness of the graphite oxide or the graphene oxide is 100um-10 mm.

Compared with the prior art, the preparation method of the high-thermal-conductivity block has the beneficial effects that: the prepared high-heat-conductivity block can greatly improve the longitudinal heat-conductivity and meet the use requirements of high-thickness occasions.

Detailed Description

Example 1

A preparation method of a high thermal conductivity block comprises the following steps:

s1, crushing artificial graphite to obtain a material A, wherein the thermal conductivity of the material A is more than 1000w/m.k, the length of the material A is 1mmmm, the width of the material A is 1um, and the thickness of the material A is 1 um; crushing expanded graphite to obtain a material B;

s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A, and the ratio of the material B to the material A is 3: 1;

s3, pressing the mixed material A and material B into blocks to form blocks with the thickness of 1mm and the density of 0.1g/cm³The surface of the block body forms a large number of micro-pore structures which penetrate through the whole thickness direction;

s4, coating or impregnating graphite oxide or graphene oxide on the block, wherein the thickness of the graphite oxide or graphene oxide is 100 um;

specifically, one side is coated, then dried at the temperature of 60 ℃, and then the other side is coated and dried at the temperature of 40 ℃;

s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;

s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2g/cm³The high thermal conductivity block.

Example 2

A preparation method of a high thermal conductivity block comprises the following steps:

s1, crushing artificial graphite to obtain a material A, wherein the thermal conductivity of the material A is more than 1000w/m.k, the length of the material A is 1000mm, the width of the material A is 100um, and the thickness of the material A is 100 um; crushing expanded graphite to obtain a material B;

s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A, and the ratio of the material B to the material A is 7: 1;

s3, pressing the mixed material A and material B into blocks to form blocks with the thickness of 10cm and the density of 1g/cm³The surface of the block body forms a large number of micro-pore structures which penetrate through the whole thickness direction;

s4, coating or impregnating graphite oxide or graphene oxide on the block, wherein the thickness of the graphite oxide or graphene oxide is 10 mm;

specifically, one side is coated, then dried at the temperature of 80 ℃, and then the other side is coated and dried at the temperature of 80 ℃;

s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;

s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 2g/cm³The high thermal conductivity block.

Example 3

A preparation method of a high thermal conductivity block comprises the following steps:

s1, crushing artificial graphite to obtain a material A, wherein the thermal conductivity of the material A is more than 1000w/m.k, the length of the material A is 500mm, the width of the material A is 1-100 um, and the thickness of the material A is 50 um; crushing expanded graphite to obtain a material B;

s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A, and the ratio of the material B to the material A is 5: 1;

s3, pressing the mixed material A and material B into blocks to form blocks with the thickness of 5cm and the density of 0.5g/cm³The surface of the block body forms a large number of micro-pore structures which penetrate through the whole thickness direction;

s4, coating or impregnating graphite oxide or graphene oxide on the block, wherein the thickness of the graphite oxide or graphene oxide is 5 mm;

specifically, one side is coated, then dried at the temperature of 70 ℃, and then the other side is coated and dried at the temperature of 60 ℃;

s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;

s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.6g/cm³The high thermal conductivity block.

The high-thermal-conductivity block prepared by the method can greatly improve the longitudinal thermal conductivity, the longitudinal thermal conductivity is more than 50w/m.k, and the use requirement of high-thickness occasions is met.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.